Oil pump "3" takes oil through oil intake "6" from oil sump "4" and supplies it to the main oil filter. At the outlet of the oil pump there is a pressure reducing valve "5". The valve opens at too high pressure, and some of the oil flows back into the oil sump.
Oil enters the main channel along the central axis of the cartridge "1" of the oil filter. When the oil filter is clogged, the bypass valve opens and ensures the supply of unfiltered oil to the main channel. The lubrication channels of the crankshaft bearings "2" branch off from the main channel. Through the inclined holes in the crankshaft, oil enters the connecting rod bearings and from there is sprayed onto the piston pins and cylinders.
At the same time, engine oil is supplied through inclined channels to the cylinder head to the camshaft bearings, rocker arm shafts and rocker arm supports.